maxbillington
Elec Engineer, Adjunct Faculty
- Location
- Colorado
- Occupation
- Prof Engineer
I had a staff member ask whether a 25, 35 or 45 amp breaker can be used to protect a branch circuit.
Article 210.3 lists branch circuit ratings as 15, 20, 30, 40 and 50 amps. Likewise, Table 210.24 provides a summary of branch circuit requirements. 25, 35 or 45 amp breaker sizes are not mentioned, even though they are commonly available.
Article 240.6 lists standard trip ratings as 15, 20, 25, 30, 35, 40, 45 and 50 amps.
So, even though a 25, 35 or 45 amp breaker is a standard size, can they not be used to protect a branch circuit?
Article 210.3 lists branch circuit ratings as 15, 20, 30, 40 and 50 amps. Likewise, Table 210.24 provides a summary of branch circuit requirements. 25, 35 or 45 amp breaker sizes are not mentioned, even though they are commonly available.
Article 240.6 lists standard trip ratings as 15, 20, 25, 30, 35, 40, 45 and 50 amps.
So, even though a 25, 35 or 45 amp breaker is a standard size, can they not be used to protect a branch circuit?